Ch 9 HW Part 1 Electron Domain Geometry and Molecular Geometry

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Ch. 9 HW, Part 1: Electron Domain Geometry and Molecular Geometry Mélecfilar éeometry Bonding Theories Coee, IR IMNIRER This is Part 1 for the Chapter 9 Homework which includes problems that cover electron domain geometry (EDG) and molecular geometry (MG). 1/1point For each of the following molecules or polyatomic ions, determine 1) electron domains (ED) around the central atom 2) the electron domain geometry (EDG) 3) the molecular geometry (MG) ~o\ Answer Parameters: ¢ For the number of electron domains, enter a whole number only. ¢ For the names of the EDG and MG names, type the exact name (correctly spelled) with no additional spaces or characters. Name H,S OF, ED uz 4 tetrahe- Bent dral NO,- 3 trigonal Bent 2 planar fl: uz HCN l I linear I I Linear tetrahe- Tetrahed dral ral CH,CI
B What s the electron-domain geometry (EDG), and molecular geometry (MG) for the ball and stick model pictured? @ (O EDG: Octahedral; MG: See-saw () EDG: Tetrahedral; MG: Tetrahedral n © EDG: Octahedral, MG: Square pyramidal (O EDG: Trigonal bipyramidal; MG: See-saw () EDG: Trigonal bipyramidal; MG: Trigonal bipyramidal
n 0,667/ 1 point The bond angles marked a, b, and c in the molecule above are about B H- 8- . ,and _respectively. Al of the molecules below have a tetrahedral EDG. Order the molecules from the LARGEST to SMALLEST bond angle. LARGEST BOND ANGLE CHy NH; H,0 SMALLEST BOND ANGLE
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I I draw Lewis structure To determine the polarity of a molecule we first . I I molecular geometry and we determine the . Then we draw an arrow representing the bond dipole (the polarity of the bond) pointing from the positive to the more electronegative atom . If the overall (net) effect of all the dipole moments in each bond DO NOT CANCEL each other out due to the I I polar three dimensional shape of the molecule, then the molecule is it I I nonpolar the dipole moments CANCEL , the molecule is . Feedback General Feedback To determine the polarity of a molecule we first draw Lewis structure, and we determine the molecular geometry. Then we draw an arrow representing the bond dipole (the polarity of the bond) pointing from the positive to the more electronegative atom. If the overall (net) effect of all the dipole moments in each bond do not cancel each other out the molecule is polar. If the dipole moments cancel, the molecule is nonpolar.
Determining Molecular Polarity To determine polarity of a molecule, first determine the molecular geometry (MG) and then draw an arrow pointing from the positive to negative side of each bond. The overall effect of each dipole is then considered. a - 1 I b el 80, T - & C\CCI o C\CIC| cHa, ca, Nonpolar Molecules * Polar Molecule: If the geometry of the molecule is such that the bond dipole vectors COMBINE (do NOT cancel), the molecule is polar (P). ¢ Nonpolar Molecule: If the geometry of the molecule is such that the sum of all of the bond dipole vectors CANCEL OUT, the molecule is nonpolar, (NP). Which of the following molecules are POLAR? Classify each of the following molecules in the appropriate category. Polar Molecules PFS I SF‘ | BCIS \/ \/ 1/1 point O Nc1, O TeCly O HF O sFy Which of the following molecules has polar bonds but is a nonpolar molecule?